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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c35b681044ee6661d85701584b89ed722b99f54399f4900bfb12e92b1d55e0c' 
  AND token = 'B2cN8j4bqVJYQcDXaomfC/TDRF9FtJQy2acAMsFqYmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}